. And after compiling the coding, I have added the .hex file created to the circuit I simulated, but the problem is that the logic is not workig, i.e. if I make inputs RB0 to RB3 ANDed value is zero, the LED connected to the RA0 output lights up.
I have attached the .hex file, .asm file.
As for the proteus ISIS .DSN file it is here: